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/*
* Electronic Arts TQI Video Decoder
* Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Electronic Arts TQI Video Decoder
* @author Peter Ross <pross@xvid.org>
* @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
*/
#include "avcodec.h"
#include "blockdsp.h"
#include "bswapdsp.h"
#include "get_bits.h"
#include "aandcttab.h"
#include "eaidct.h"
#include "idctdsp.h"
#include "internal.h"
#include "mpeg12.h"
typedef struct TqiContext {
AVCodecContext *avctx;
GetBitContext gb;
BlockDSPContext bdsp;
BswapDSPContext bsdsp;
IDCTDSPContext idsp;
ScanTable intra_scantable;
void *bitstream_buf;
unsigned int bitstream_buf_size;
int mb_x, mb_y;
uint16_t intra_matrix[64];
int last_dc[3];
DECLARE_ALIGNED(32, int16_t, block)[6][64];
} TqiContext;
static av_cold int tqi_decode_init(AVCodecContext *avctx)
{
TqiContext *t = avctx->priv_data;
ff_blockdsp_init(&t->bdsp, avctx);
ff_bswapdsp_init(&t->bsdsp);
ff_idctdsp_init(&t->idsp, avctx);
ff_init_scantable_permutation(t->idsp.idct_permutation, FF_IDCT_PERM_NONE);
ff_init_scantable(t->idsp.idct_permutation, &t->intra_scantable, ff_zigzag_direct);
avctx->framerate = (AVRational){ 15, 1 };
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
ff_mpeg12_init_vlcs();
return 0;
}
static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
{
int n;
t->bdsp.clear_blocks(block[0]);
for (n = 0; n < 6; n++) {
int ret = ff_mpeg1_decode_block_intra(&t->gb,
t->intra_matrix,
t->intra_scantable.permutated,
t->last_dc, block[n], n, 1);
if (ret < 0) {
av_log(t->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
t->mb_x, t->mb_y);
return ret;
}
}
return 0;
}
static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
int16_t (*block)[64])
{
TqiContext *t = avctx->priv_data;
ptrdiff_t linesize = frame->linesize[0];
uint8_t *dest_y = frame->data[0] + t->mb_y * 16 * linesize + t->mb_x * 16;
uint8_t *dest_cb = frame->data[1] + t->mb_y * 8 * frame->linesize[1] + t->mb_x * 8;
uint8_t *dest_cr = frame->data[2] + t->mb_y * 8 * frame->linesize[2] + t->mb_x * 8;
ff_ea_idct_put_c(dest_y , linesize, block[0]);
ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
}
}
static void tqi_calculate_qtable(TqiContext *t, int quant)
{
const int64_t qscale = (215 - 2*quant)*5;
int i;
t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;
for(i=1; i<64; i++)
t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
}
static int tqi_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
const uint8_t *buf_end = buf+buf_size;
TqiContext *t = avctx->priv_data;
AVFrame *frame = data;
int ret, w, h;
if (buf_size < 12)
return AVERROR_INVALIDDATA;
t->avctx = avctx;
w = AV_RL16(&buf[0]);
h = AV_RL16(&buf[2]);
tqi_calculate_qtable(t, buf[4]);
buf += 8;
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
return ret;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
buf_end - buf);
if (!t->bitstream_buf)
return AVERROR(ENOMEM);
t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
(buf_end - buf) / 4);
init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
t->last_dc[0] =
t->last_dc[1] =
t->last_dc[2] = 0;
for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
if (tqi_decode_mb(t, t->block) < 0)
goto end;
tqi_idct_put(avctx, frame, t->block);
}
}
end:
*got_frame = 1;
return buf_size;
}
static av_cold int tqi_decode_end(AVCodecContext *avctx)
{
TqiContext *t = avctx->priv_data;
av_freep(&t->bitstream_buf);
return 0;
}
AVCodec ff_eatqi_decoder = {
.name = "eatqi",
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_TQI,
.priv_data_size = sizeof(TqiContext),
.init = tqi_decode_init,
.close = tqi_decode_end,
.decode = tqi_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
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